Lactose intolerance is a genetic gastrointestinal disorder in which body is unable to digest lactose – a sugar found in milk and dairy products. Medically this condition is called Hypolactasia. Ingestion of milk may lead to abdominal cramps, bloating, distension, flatulence and diarrhea. Symptoms of lactose intolerance are sometimes intolerable by patient. Mutation in MCM6 gene is responsible for fluctuation in production of lactase enzyme in humans. This condition is inherited in autosomal recessive pattern, where the parents which carries faulty gene have chances to pass this gene to their children.